“She [Christopher] tried to charge several charges on my American Express and she tried to open up two Capital One cards on my husband’s account using his Social Security number that she had stolen,” McCarthy told ABC News.

When packages of items they had not purchased arrived at the McCarthys’ home in June, just days after Christopher dog-sat for them, McCarthy took a photo of the nanny’s license plate and called police, according to WSB-TV.

Police say the nanny the McCarthys hired is actually a woman named Gina Groves, who had warrants for her arrest in four counties. Groves gave a fake name to Care.com, which is why her background check came back clean, police said.

“I just could not believe I was so gullible to have let a virtual, a complete stranger into my house and left her at home alone with my child,” McCarthy said.

Groves was arrested for violating her probation on June 21, 2015, and is currently in the Douglas County Jail, according to WSB-TV, whose investigative reporter found six mugshots of Groves dating back more than two decades.

Care.com called the McCarthys’ experience a “highly unfortunate incident” in a statement to ABC News, writing, in part, “This provider is a career criminal who violated our terms and conditions by providing false information.”

Cyber security experts recommend parents do an online search of the provider themselves to make sure their pictures match.

Experts also recommend checking references, setting up a nanny cam in your home and coming home earlier than expected when first using a new babysitter.